<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要BB的内容（最多120字）" maxlength="120" v-model="msg">

        </textarea>
        <mt-button type="primary" size="large" @click='postComment'>发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i + 1 }}楼&nbsp;&nbsp;用户:{{ item.user_name}}&nbsp;&nbsp;发表时间:{{ item.add_time | dataFormat}}
                </div>

                <div class="cmt-body">
                     {{ item.content === 'undefined' ? '此用户很懒': item.content}}
                </div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click='getMore'>加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from 'mint-ui'
export default {
    data(){
        return {
            pageindex:1 ,    //默认展示第一页数据
            comments:[],
            msg:'' //评论输入的内容
        }
    },
    created(){
        this.getComments()
    },
    methods:{
        getComments(){
            // this.$http.get("api/getcomments/" + this.id + "?pageindex" + this.pageindex).then(result => {
           this.$http.get('comment'+this.pageindex+'.json').then(result => {
               if(result.body.status === 0){
                //    this.comments = result.body.message;
                //每当获取新评论数据的时候不要把老数据清空覆盖，而是以老数据拼接上新数据

                this.comments = this.comments.concat( result.body.message )

               }else{
                   Toast("获取评论失败")
               }
            })
        },
        getMore(){
            this.pageindex++;
            this.getComments();
        },
        
        postComment(){  //发表评论
            //校验是否为空内容
            if(this.msg.trim().length === 0){
                return Toast('评论内容不能为空！')
            }

            //参数1：请求的URL地址
            //参数2：提交给服务器的数据对象
            //参数3：定义提交时候表单中数据的格式 { emulateJSON:true }
            // this.$http.post('api/postcomment/' + $route.param.id, { content:this.msg.trim()})
            // this.$http.post('postcomment.js',{ content:this.msg.trim()},{emulateJSON:true})
            this.$http.get('postcomment.js')
            .then(function(result){
                if(result.body.status === 0){

                }else{
                    // 1. 拼接出一个评论对象
                    var cmt = { 
                        user_name:"匿名用户",
                        add_time:Date.now(),
                        content:this.msg.trim()}
                    this.comments.unshift(cmt)
                    this.msg = ""
                }
            })
        }
    },
    props:['id']
}
</script>

<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size: 14px;
        height:85px;
        margin:0;
    }

    .cmt-list{
        margin:5px 0 ;
        .cmt-item{
            font-size:13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>
